公开(公告)号：US10362538B2

公开(公告)日：2019-07-23

申请号：US15663467

申请日：2017-07-28

Applicant: Cisco Technology, Inc.

Inventor： Zhigang Gao ,  Paul J. Stager ,  Fred J. Anderson

IPC: H04W52/02 ,  H04L27/26 ,  H04W72/04 ,  H04W16/14 ,  H04L5/00 ,  H04W76/28

Abstract: Techniques are disclosed for generating 802.11 packets that simulate an 802.11ba Wake-Up Radio (WUR) packet by wireless access points (APs) that implement pre-802.11ba standards. According to one embodiment disclosed herein, a predefined bit stream including a plurality of data bits is evaluated. A data bit of the plurality is mapped to one of a plurality of subcarriers. A symbol is encoded in a data payload of a network packet based on the mapping of the data bit to the subcarrier. The symbol simulates an on-off key (OOK)-modulated symbol in a WUR sequence. The network packet is transmitted to a client device.

公开(公告)号：US10285148B2

公开(公告)日：2019-05-07

申请号：US15582024

申请日：2017-04-28

Applicant: Cisco Technology, Inc.

Inventor： Paul J. Stager ,  David S. Kloper ,  Brian D. Hart ,  Matthew A. Silverman

IPC: H04W56/00

Abstract: Techniques are disclosed to synchronize wireless signal transmission by endpoints controlled by a central controller. For example, an example method of wireless communication includes receiving, at a first device, over a wired medium between the first device and a second device, a plurality of packets from the second device. Each of the plurality of packets comprises data representative of a portion of a signal corresponding to a wireless medium. The method further includes receiving, at the first device, from the second device over the wired medium a synchronization signal based on a common master clock at the second device. The method further includes synchronizing, at the first device, a local clock of the first device to the common master clock based on the synchronization signal. The method further includes reconstructing the signal corresponding to the wireless medium based on the plurality of packets and the synchronized local clock.

公开(公告)号：US10277384B2

公开(公告)日：2019-04-30

申请号：US15479077

申请日：2017-04-04

Applicant: Cisco Technology, Inc.

Inventor： David S. Kloper ,  Brian D. Hart ,  Paul J. Stager

IPC: H04L7/00 ,  H04L12/10

Abstract: Embodiments herein describe using an intermediate distribution frame (IDF) which is connected between a central controller and a plurality radio heads which each include at least one antenna for wireless communication with a user device. Instead of running separate cables to each of the radio heads, a single cable can be used to connect the IDF to the central controller and then separate cables can be used to connect the IDF to the radio heads. If the IDF is disposed near the radio heads, the amount of cables can be reduced. Moreover, the IDF may recover a clock signal used by the central controller and forward that clock to the plurality of radio head in order to synchronize the radio heads to the central controller.

公开(公告)号：US10243665B2

公开(公告)日：2019-03-26

申请号：US15722083

申请日：2017-10-02

Applicant: Cisco Technology, Inc.

Inventor： Fred J. Anderson ,  Oscar Bejarano Chavez ,  Matthew A. Silverman ,  Paul J. Stager

IPC: H04B10/564 ,  H04W52/02 ,  H04B7/024 ,  H04B10/079

Abstract: Presented herein are techniques to ensure power emitted by APs during a cooperative MIMO transmission is within certain limits. For a transmission to be made from two or more wireless access points using cooperative multiple-input multiple-output (MIMO) techniques, a measure of separation is determined between the two or more access points. Precoding of signals to be transmitted by the two or more access points is adjusted so as to derate the signals to be transmitted or disable the cooperative nature of the transmission from the two or more access point depending on the measure of separation so that a combined output power from the two or more access points is within a limit.

公开(公告)号：US20180324858A1

公开(公告)日：2018-11-08

申请号：US15585400

申请日：2017-05-03

Applicant: Cisco Technology, Inc.

Inventor： David Kloper ,  Brian D. Hart ,  Matthew A. Silverman ,  Paul J. Stager

IPC: H04W74/08 ,  H04W74/00

CPC classification number: H04W74/0816 ,  H04L1/0002 ,  H04L1/0007 ,  H04L2001/0092 ,  H04W74/004 ,  H04W74/006 ,  H04W88/085

Abstract: A central processor subsystem controls multiple transceivers. Each transceiver transmits protocol data units from antennas of that transceiver and produces receive waveforms from wirelessly received signals at the one or more antennas. A transmit waveform, including a frame addressed to one or more wireless client devices, is sent through a first transceiver to be transmitted wirelessly by the first transceiver on a frequency channel. A receive waveform, representative of the transmission by the first transceiver and wirelessly received at a second transceiver, is received from the second transceiver. While the transmit waveform is being sent to the first transceiver: a level of collision between the receive waveform and another transmission on the frequency channel is detected; and if the level of collision exceeds a threshold prior to an end of the receive waveform, the transmit waveform being sent to the first transceiver is modified to reduce the collision.

公开(公告)号：US20180045805A1

公开(公告)日：2018-02-15

申请号：US15725054

申请日：2017-10-04

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Brian Donald Hart ,  Paul J. Stager ,  Santosh Pandey ,  David Kloper ,  Dan Lyons ,  Matthew A. Sliverman

IPC: G01S3/38 ,  H04W64/00

CPC classification number: G01S3/38 ,  G01S1/68 ,  G01S3/48 ,  H04W64/006

Abstract: In one embodiment, an apparatus includes a processor for processing a plurality of radio frequency chains at a wireless device in a block based modulation environment, recording subcarrier phases and differences between the subcarrier phases, and using the subcarrier phase differences to construct a feature vector for use in angle of arrival calculated positioning of a mobile device, and memory for storing the subcarrier phases and the feature vector.

公开(公告)号：US09877251B2

公开(公告)日：2018-01-23

申请号：US14449763

申请日：2014-08-01

Applicant: Cisco Technology, Inc.

Inventor： Paul J. Stager ,  Tak Ming Pang ,  Evgeny Yankevich ,  Arnab Sengupta

IPC: H04W36/18 ,  H04W36/32 ,  H04W36/00 ,  H04W36/30 ,  H04W84/00 ,  H04W48/16

CPC classification number: H04W36/18 ,  H04W36/0061 ,  H04W36/0083 ,  H04W36/0088 ,  H04W36/30 ,  H04W36/32 ,  H04W48/16 ,  H04W84/005

Abstract: Access points and a wireless client device, such as a workgroup bridge, are configured to optimize a roaming algorithm of the client device for a high-speed vehicle scenario, such as a high-speed train. A static/dynamic neighbor list is generated and used to improve scanning efficiency. An improved parent access point selection procedure, metrics, and thresholds are provided to optimize client roaming along the vehicle's path, e.g., the train track.

公开(公告)号：US20170346547A1

公开(公告)日：2017-11-30

申请号：US15496056

申请日：2017-04-25

Applicant: Cisco Technology, Inc.

Inventor： Paul J. Stager ,  Matthew A. Silverman ,  Brian D. Hart ,  David Kloper

IPC: H04B7/08 ,  H04B1/10 ,  H04B7/0452 ,  H04W88/08

CPC classification number: H04B7/0885 ,  H04B1/1036 ,  H04B7/024 ,  H04B7/0452 ,  H04L25/03 ,  H04L43/16 ,  H04W88/085

Abstract: A system and method are provided for performing stomp-and-restart techniques in distributed MU-MIMO system. A plurality of radio head devices are provided that are configured to be deployed separated from each other in a coverage region of interest of a wireless network. A central processor subsystem is provided that is in communication with the plurality of radio head devices. The central processor subsystem configured to perform several operations based on downconverted samples received from the plurality of radio head devices.

公开(公告)号：US20170171772A1

公开(公告)日：2017-06-15

申请号：US14967483

申请日：2015-12-14

Applicant: Cisco Technology, Inc.

Inventor： John Martin Blosco ,  Matthew Aaron Silverman ,  John Matthew Swartz ,  Joshua David Suhr ,  Paul J. Stager

IPC: H04W28/04 ,  H04W36/30 ,  H04W36/04 ,  H04W24/08 ,  H04L1/00

CPC classification number: H04W36/06 ,  H04L1/0061 ,  H04L41/0816 ,  H04L43/0829 ,  H04W24/08 ,  H04W28/04 ,  H04W36/04 ,  H04W36/30 ,  H04W84/12

Abstract: Noise floor degradation detection may be provided. First, an incremental packet loss rate for a secondary radio may be calculated that indicates an impact on packet reception on the secondary radio due to transmissions by a primary radio. The secondary radio and the primary radio may comprise an access point. Next, it may be determined that the incremental packet loss rate is greater than a predetermined value. A configuration of the access point may be changed in response to determining that the incremental packet loss rate is greater than the predetermined value.

公开(公告)号：US09655057B2

公开(公告)日：2017-05-16

申请号：US14446993

申请日：2014-07-30

Applicant: Cisco Technology, Inc.

Inventor： John Matthew Swartz ,  Joshua Suhr ,  Matthew A. Silverman ,  Paul J. Stager

IPC: H04W4/00 ,  H04W52/24 ,  H04W52/22 ,  H04W52/50 ,  H04W84/12 ,  H04W52/14 ,  H04W52/40

CPC classification number: H04W52/241 ,  H04W52/143 ,  H04W52/223 ,  H04W52/242 ,  H04W52/245 ,  H04W52/40 ,  H04W52/50 ,  H04W84/12

Abstract: Apparatus and techniques are presented for estimating a noise floor experienced by a client device seeking to associate with an access point in a wireless network. A path loss between the client device and the access point may be estimated. A metric may then be generated, where the metric estimates a strength of a signal transmitted from the access point as received at the client device. The transmit power at the access point may then be adjusted, based on the metric.